More cleanups for bug #56814 and some more external entity leaks of #56164 git-svn-id: https://svn.apache.org/repos/asf/poi/branches/REL_3_10_BRANCH@1617854 13f79535-47bb-0310-9956-ffa450edef68
git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1299338 13f79535-47bb-0310-9956-ffa450edef68
git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@903170 13f79535-47bb-0310-9956-ffa450edef68